1. Birth Defects Monitoring Program, State Center for Health Statistics, Division of Public HealthNorth Carolina Department of Health and Human Services Raleigh North Carolina
2. Department of Biostatistics, Gillings School of Global Public HealthUniversity of North Carolina at Chapel Hill Chapel Hill North Carolina
3. Early Intervention Branch, Women's and Children's Health Section, Division of Public HealthNorth Carolina Department of Health and Human Services Raleigh North Carolina
4. Department of Maternal and Child Health, Gillings School of Global Public HealthUniversity of North Carolina at Chapel Hill Chapel Hill North Carolina